Winding machine



1/5 I R. G. MCCOY BY 19 %4c XM ATTORNEY Jan. 22, 1946. McCQY 2,393,548

WINDING MACHINE- Filed Sept. 1, 1944 9 Sheets-Sheet 2 lNVENTO/Q R a. mcor A TTORNEY I Jan. 22, 1946. R, G; MCCOY 2,393,548

WINDING MACHINE 9 Sheets-Sheet 3 Filed Sept. 1. 1944 INVENTOR R. G. McCOY By %MA A TTORNE Y Jan. 22, 1946.

R. G. M coY 2,393,548

WINDING MACHINE Filed Sept. 1, 1944 9 SheetsSheet4 /Nl ENTOR R G MCCOY A TTORNEY Jan. 22, 1946. R, G, MC OY 2,393,548

WINDING MACHINE Filed Sept. 1, 1944 9 Sheets-Sheet 5 n INVENTOR km R. a. McCOY a acma A TTORNE Y Jan. 22, 1946. McCOY 2,393,548

WINDING MACHINE Filed Sept. 1. 1944 9 Sheets-Sheet 6 ATTORNEY Jan. 22, 1946. Moc OY 2,393,548 winnme momma:

Filed Sept. 1. 1944 9 Sheets-Sheet 9 FIG. 22 FIG. 23 FIG. 24

INVENTOR R G McCO) ff wx/w ATTORNEY Patented Jan. 22, 1946 WINDING MACHINE Robert G. McCoy, New York, N. Y., assignor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York.

Application September 1, 1944, Serial No. 552,254

16 Claims.

This invention relates to a winding machine and more particularly to a machine for winding wire or other strand material onto a card-like support.

Card-like supports wound with wire are used as resistance elements in potentiometers and other electrical devices and in some cases the card-like support is not uniform in width from end to end but has one of its edges contoured to a required curve form. Conventional type winding machines are unsuitable for accurately winding wire onto card-like supports of some irregular forms required.

The object of this invention is to provide a machine by means of which a wire may be accurately wound onto a card-like support of irregular form.

The invention resides in a winding head in which improved means are provided for accurately winding and supporting each turn of wire in its required place on the card-like support.

One feature in the winding head resides in a cam operated semicircular plate which is one of a pair of semicircular plates and a movable bar carried by the cam operated plate and which cooperates therewith to guide each turn of wire to a required position on the card-like support and briefly hold each turn of wire in its required position on the card-like support when the edge of the card-like support is of a descending or receding slope form.

Another feature resides in a wire positioning device which has a wire positioning unit involving a finger device which operates to guide each turn of wire to its required place on the card-like support and support the turn of wire against slipping along the edge of the card-like support during the critical period of winding the turn of wire across the edge of the card-like support when the edge of the card-like support is of ascending form.

Another feature resides in means provided for controlling the operation of the above-mentioned finger device.

Another feature resides in a resilient guide device for guiding the wire against the semicircular plate during the critical instant of laying the wire onto the straight edge of the card-like support for the purpose of insuring proper wire position and spacing along the edge of the card-like support.

Another feature resides in a spool holder for a spool containing a suppl of the wire, the spool holder being operable at variable speeds to rotate the spool of wire at variable speeds and to cause the spool to release wire from the spool at required rates during the operation of the winding machine.

Another feature resides in a brake device controlled by means of a flier. arm and cooperating with the flier arm and a spool holder and spool to maintain a required tension on the wire while the wire is passing from the winding head onto the card-like support.

In the drawings:

Fig. l is a front elevational view of the winding machine embodying some parts of the invention;

Fig. 2 is a face view partl in section of the winding head and shows a card-like support on which the wire is being wound and parts of the means provided in the machine for supporting the winding head. Fig. 2 is taken from the left of the winding machine shown in Fig. 1 and is enlarged relative to the showing of the winding head in that figure;

Fig. 3 is a view corresponding to Fig. 2 but with some of the parts removed and other parts in different positions;

Fig. 4 is an edge view of the winding head as seen from the front of the winding machine and shows a portion of a card-like support on which wire is being wound;

Fig. 5 is a partial cross-sectional view of the winding head shown in Figs. 3 and 4 and sectioned on the line 55 of Fig. 3;

Fig. 6 is an enlarged view of the semicircular plates in the winding head and taken from the right in Fig. 5;

Fig. 7 is a view, partly in section, of a portion of a ring gear and a portion of a brake drum provided in the winding head and shows parts of a brakeimechanism operable on the drum;

Fig. 8 is a view, in reduced scale, of parts of the winding head taken on the line 88 of Fig.

Fig. 9 is an enlarged view, in schematic, of a portion of a card-like support on which wire is being wound by means of the machine and shows a portion of one of the semicircular plates and the bar for briefly holding each turn of wire in place while the turn of wire is taking its position on the card-like support when the edge on the card-like support is of a descending character;

Fig. 10 is an enlarged view, in schematic, of a portion of a card-like support on which wire is being wound by means of the machine and shows the finger for guiding each turn of wire to its required place on the card-like support and holding the turn of wire in place during the critical period of winding the wire across an edge of the card-like support and when the edge on the card-like support is of an ascending character;

Fig. 11 is a front edge view of a bracket and devices supported thereon and involving an electromagnet and other means for operating the finger above mentioned;

Fig. 12 is another view of the bracket and devices shown in Fig. 11 and taken from the left of that figure;

Fig. 13 is still another view of the bracket and devices shown in Fig. 11 and taken from the right of that figure Fig. 14 is a rear edge View of the bracket and devices shown in Fig. 11;

Fig. 15 is a top plan view of the bracket and devices shown in Fig. 11 and shows in dot-dash lines a card-like support on which wire may be wound;

Fig. 1-8 is an enlarged view in perspective of the finger, the supporting means therefor and part of the means for operating the finger;

Figs. 17 through 29A are illustrations of certain parts employed in the winding head and show steps in the winding of the wire onto the cardlike support and the relative positions taken by the parts during the operation. Some of the parts in these figures are shown in section, some are shown in reduced scale and some are shown in enlarged scale relative to other illustrations of the parts in the preceding figures in the drawings; and

Fig. 30 shows a card-like support with wire wound thereon by means of the present invention.

In some precision electrical potentiometers now required, one of the parts of the potentiometer is a resistance element comprising a card-like support and a resistance wire wound on the cardlike support. The resistance element is arranged for engagement by a wiper contact which successively engages each turn of resistance wire on the resistance element. The card-like support serves as an insulating support for the wire winding and in some cases the card-like support is made so that the width is not uniform throughout the length of the card-like support.

Fig. 30 illustrates one of the many forms of card-like supports wound with resistance wire and used as resistance elements in precision potentiometers. In this case one long edge of th cardlike support is formed at some points so that it does not run parallel with the other long edge and is of wave-like attern. The wave-like pattern of one long edge of the card-like support as viewed in Fig. 30, in effect runs uphill at some points and downhill at other points and it will be appreciated that when a resistance wire is being Wound onto the card-like support and so that the turns of wire extend transversely of the run of the card-like support some means must be provided either on the card-like support or in the wire winding machine to insure that each turn of wire will take its required place on the cardlike support and will not slip from its required position on the card-like support.

The card-like support may be made of any material suitable for the purpose but should be of such character at least on the long edge portions that when the wire is being wound on the card-like support under a suitable tension the turns of wire will be partly embedded in the long edge portions of the card-like support. It will be assumed, however, merely for the purpose of explaining the present invention and not in the sense of a limitation thereof that the card-like support is made of hard sheet rubber. The cardlike support will also be hereinafter called a card and it will be understood that wherever the word "card hereinafter appears in the specification and claims it means a card-like support suitable for serving as a support for a winding of wire or other strand material.

As shown in Fig. 1, the winding machine 22, embodying the present invention, follows the general pattern of a lathe comprising a bed 23, a head stock 24, a tail stock 25 and a winding head 26. The head stock 24 and tail stock 25 are equipped with clamps 21 and 26 respectively for holding a card 29 in suitable position for wire to be wound thereon by means of the winding head 26. The head stock 24 contains a system of gears, not shown, for imparting movement to certain parts of the winding machine and may also contain a driving motor for the machine.

When a card 29 is to be wound with wire, the card 29 is clamped in place in the machine 22 by means of the clamps 21 and 26 and so that the card 29 extends between the head stock 24 and the tail stock 25 and in parallel spaced relation with the bed 23. The card 29 is held stationary in this position while the winding head 26 is operated to wind the wire around the card 29.

The winding head 26 comprises a ring gear 30 and other parts which will be subsequently described and operable to wind the wire onto the card 29. Means are provided in the winding machine to cause relative movement of the winding head 26 and the card 29 so that as parts of the winding head 26 are rotated around the position of the card 29 the wire coming from the winding head 26 will be wound in successive turns onto the card 29. Various means may be provided to cause relative movement of the winding head 25 and the card 29 without departing from the sp t of the present invention. For instance, means might be provided to move the card 29 longitudinally while the winding head 26 remains in a certain position and while parts of the winding head 26 are rotated around the card 29, or as shown in the drawings, the card 29 might be held stationary while the winding head 26 is driven alon the length of the card and parts of the winding head 26 are rotated around the card 29.

The winding head 26, as shown in Figs. 1, 2, 3, 4 and 5, comprises a base 3! adjustably mounted on a platform 32 extending transversely across the bed 23 and resting on and slidable along tracks 33 and 34 formed on the bed 23. An apron 35 secured to the platform 32 and extending downwardly thereof is provided with means to manually and automatically move the platform 32 along the bed 23. The means for manually moving the platform 32 along the bed 23 comprises a manually operated wheel 36 which is supported on a rotatable shaft 31 on an end of which is a pinion, not shown, but engaging a rack 36 extending along the front of the bed 23. For automatic movement of the platform 32 along the bed 23 a clutch, not shown, but supported on the apron 35 is provided to releasably engage a lead screw 39, the clutch being operable by means of the handle 40 to mechanically connect the apron 35 to the lead screw 39 and the lead screw 39 being gear connected at one end to the driving gears in the head stock 24.

Mounted on and extending upwardly from the base 3| is a frame 4| which is secured at its lower aeeases end by means of screws 4! to an upright flange 48 on the base 8|. As shown in Figs. 3 and the frame 4| is apertured at 44 to permit extension through the frame 4| of the card 28. An apertured extending portion 48 on the frame 4| and shown in Figs. 2 and 3 provides asupport for certain other parts of the winding head which will be subsequently explained.

The ring gear 88 is spaced from and is rotatable relative to the frame 4| and is supported by means of three wheels 48, 41 and 48 which are grooved on their peripheral portions to receive a double beveled edge 49 shown in Fig. 5 and formed on the inner annular surface of the ri gear 88. The wheels 48, 41 and 48 are individually mounted on low friction-type bearings 58, each of which is mounted on a screw bolt 5| supported in a bushing 52 mounted in an aperture provided in the frame 4|. The ring gear 88 is rotatably driven by means of a pinion 58, Fig. 2, which is rotatably supported on a low frictiontype bearing, not shown, but supported and mounted in an aperture in the extending portion 45 of the frame 4|. The pinion 58 is apertured to accommodate a driving shaft 54 which is non-circular in cross-section so that rotations of the driving shaft 54 will be imparted to the pinion 53 and the pinion 53 may slide lengthwise of the driving shaft 54 when the winding head 28 is moved along the bed of the machine. The driving shaft 54 is supported along the rear of the bed of the machine and is rotated by means of the driving means for the machine when the machine is in operation. It will be seen, therefore, that when the machine is in operation the ring gear 38 is driven by means of pinion 53 and turns around the position of the card 29.

Mounted at Spaced points on the ring gear 38 are wheels 55 only one of which is shown in Fig. 5, each wheel being supported on a low friction type bearing 56 mounted on a bolt 51 extending through a bushing 58 supported in an aperture provided in the ring gear 88. The wheels 55 may be made like the wheel 48 or may be double beveled on the periphery and serve to rotatably support an annular spool holder 58 which serves as a support for a spool 88. The wheels 55 engage in an annular groove 8| formed in the inner surface of the spool holder 59 and rotatably support the spool holder 59 so that it may be rotated relative to the ring gear 98.

The spool holder 59 in addition to serving as a support for the spool 68 also serves as part of a brake system and comprises an annular body member 62 and an annular boss 63 of smaller diameter than the body member 82, the boss 63 being connected to the body member 82 by a flat flange 84 against the outer surface of which one of the flanges on the spool 68 may rest. The outer annular surface of the body member 82 is grooved to form a brake drum 85 which is frictionally engaged by a brake device to be subsequently described.

The spool 68 comprises a barrel portion 88 and the spool heads 61 and 88 and serves as a support for a supply of wire 69, some of which is to be wound on the card 28 by operation of the winding machine. When the spool 88 is placed in required position on the spool holder 59 the spool head 81 rests against the outer face of the flange 54 and the barrel portion 88 is secured to the boss 68 by means of a key 18.

It will be seen that since the spool holder 59 is rotatably supported on the wheels 55 the spool holder 88 may be rotated at the same speed as the ring gear 88 or at a different speed from that of the ring gear 88 or may be held against rotation while the-ring gear 88 continues to retate. The spool holder 58 may also be rotated reversely relative to the direction of rotation of the ring gear 88.

Two substantially semicircular plates 1| and 12 are located in the space defined by the boss 83 and so that the two plates are normally in a common plane and wide base portions of the plates are toward each other and slightly spaced apart, the spacing being a little more than sufficient to accommodate the thicknessof the card 29. The plate 1|, as shown in Figs. 5 and 6, is equipped with spaced stud bolts 13 and 14 which are mounted on the inner face of the plate 1| and extend normal to the plane of the inner face. The stud bolts 18 and 14 extend through sleeves 15 and 16 respectively, which are supported on the frame 4| and extend normal to the plane of the inner face of. the frame 4| as shown in Fig. 3. A nut 11 and a washer 18 are provided on each stud bolt 13 and 14 to cooperate with the stud bolts in holding the plate 1| in required position as shown in Fig. 5.

The plate 12 is equipped with spaced stud bolts 19 and 88 which are mounted on' the inner face of the plate 12 and extend normal to the plane of the inner face. The stud bolts 19 and 88 extend through sleeves 8| and 82 respectively, which are supported on the frame 4| and extend normal to the plane of the inner face of theframe 4|. The stud bolts 19 and 88 are each equipped with a nut 88 and a washer 84 and on each of these stud bolts a helical spring 85is mounted and located between the washer 84 and the outer face of the frame 4| to allow movement of the plate 12 relative to the frame 4|. To impart movement to the plate 12 in one direction and against the action of the springs 85, a plunger device 88 and a cam ring 81 are provided. The plunger;v

device 86 comprises a body 88 mounted on the inner surface of the frame 4| by means of screws 88 or other suitable fastening means; an aperagainst the cam ring 81. The lower end of the v block 88 is partly cut awa to expose the lower end portion of the plunger 9| which is substantially cylindrical in form, The returning spring 82 for the plunger 9| is disposed partly within the plunger 8| and extends into engagement with an end wall 94 formed on the lower end of the body 88. A cam surface 9 5 is formed on thelower portion of the plunger 9|, the cam surface being in the form of an inclined plane with the low end at the lower end of the plunger 9| and the high end at the point where the lower portion of the plunger 9| emerges from the block 98. The cam ring 81 is securely mounted on spaced posts 88 which aresecurely mounted on the ring gear 88, the cam ring 81 being located within the space defined by the larger end portion of the spool holder 59 and being rotated by means of the ring ear 38. The inner edge of the cam ring 81 bears against the wheel 83 on the plunger device 88 as shown in Figs. 3 and 5 and operates the plunger 8| against the action of the return spring 92. The inner edge of the cam ring 81 which actuates the plunger 8| is in the'form of a spiral which recedesin a counter-clockwise direction from the innermost point 81 for 350 degrees to the outermost point 88, the inner and outer ends of the spiral being joined in the remaining 10 degrees. The cam ring 81, therefore, has in effect a low spot at 88 and a high spot at 31 and it will be seen by looking at Fig. 3 that when the cam ring 81 is rotated in a counterclockwise direction the plunger 9| is gradually pressed downward against the action of the spring 92 until the high spot 91 on the cam ring 81 passes beyond the wheel 93, When the high spot 91 passes beyond the wheel 93 the spring 92 starts to restore the plunger 9| to normal position and this position is reached when the low spot 94 is in engagement with the wheel 93. A pin 99 mounted on the plunger 9| and operating in a slot I formed in the block 90 is provided to prevent rotation of the plunger 9I in the block 30.

As shown in Figs. and 6, a wheel IOI mounted on a shaft I02 supported in spaced walls I03 and I04 is provided on the inner face of the plate 12. The wheel MI is in engagement with the cam surface 95 on the plunger 9| and is held in engagement with the cam surface 95 by the action of the springs 85 on the stud bolts 19 and 90. When the plunger 9I is pressed downwardly the plate 12 is moved out of the plane of the plate H and toward the left of the normal position of the plate 12 shown in Fig. 5. The plate 12 is shown in Figs. 17A, 19A, 20A and 21A out of the plane of the plate H. The plate 12 is returned to its normal position shown in Fig. 18A by action of the springs 85 when the plunger 9| returns to its normal position.

Supported on the inner face of the plate 12 and extending across the lower portion of the plate 12 is a track device I05 comprising an inwardly extending flange I08 on the plate 12 and a channel bar I01. The channel bar I01 is substantially J-shaped in cross-section and is so mounted on the inner face of the plate 12 that it cooperates with the flange I06 on the plate 12 to form a runway for a relatively small carriage I08 which is T-shaped in cross-section and provided with four wheels I09 supported on the cross arm section, two of the wheels I09 being arrangedin engagement with the channel bar I 01 and the other two being arranged in engagement with the inner face of the plate 12 directly above the flange I05. The lower portion IIO of the carriage I08 extends downward through the track device I05. Supported on the lower portion IIO of the carriage I08 and operating in a space III between the plates 1| and 12 is a bar II2 secured to the carriage I00 by means of screws II3. riage I08 is continually urged in one direction along the track device I05 by means of a spring motor device H4 and a tow line H5. The spring motor device H4 is supported on the inner face of the plate 12 by means of a screw I I6 and somewhat above the position of one end portion of the track device I05. One end of the tow line II5 is secured to the carriage I08 and the other end is secured to a rotor, not shown, but provided in the spring motor device .II4, Supported in one end of the track device I05 is a pulley II 1 around which the tow line I I 5 extends, the pulley II1 being positioned as shown in Fig. 6 so that when the spring motor device I I4 operates to pull the tow line II5 the carriage I08 will beurged in a right-hand direction from the position shown in Fig. 6.

As mentioned in the fifth paragraph of this specification one feature in the winding head resides in a cam operated semi-circular plate and The cara movable bar which cooperate to guide each turn of wire to a required position on the card when the edge of the card is of a descending or receding slope form. The plate and bar referred to are respectively the plate 12 and the bar II2 above described and these parts cooperate to support and guide each turn of the wire while the wire is being wound on the card 29. The manner in which the parts cooperate will be subsequently described.

In Figs. 1, 4, ll, 12, 13, 14 and 15 a wire positioning device H8 is shown and this wire positioning device IIB as shown in Figs. 1 and 4 is mounted on the base 3I of the winding head 29.

The wire positioning device II8 comprises a vertical plate type support II9, an electromagnet I and a wire positioning unit I2I, an enlarged view in perspective of the wire positioning unit I2I being shown in Fig. 16. The plate type support II9 is secured at its lower end by means of screws I22 to a bracket I23 which is secured by means of screws I24, as shown in Fig. 4, to one side of the base 3I of the winding head 26. A horizontal top portion I25 on the support II9 serves as a support for the wire positioning unit I2I and certain other parts of the device H8.

The coil portion of the electromagnet I20 is supported in a flanged U-shaped holder I26 and is secured thereto by means of a screw I21 which extends through the closed end of the holder I20 and through a spacer I28 and into the lower end of the core of the electromagnet I20. The holder I26 is secured to the outer flat surface of the support II9 by means of screws I29. An armature I30 of the electromagnet I20 is secured to a yoke I3I, the ends I32 and I33 of which are welded or otherwise secured to edge portions of the flat bars I34 and I35 respectively, which are pivotally supported on pins I36 and I31 mounted in and extending from blocks I38 and I39 secured by means of screws I40 to the horizontal top portion I25 on the upper end of the support H9. The flat bars I34 and I35 extend upwardly from the ends of the yoke I3I to form in cooperation with the ends of the yoke I3I, in effect, bell crank levers at each end of the yoke I3 I. Bridged across the space between the upper ends of the flat bars I34 and I35 and secured thereto is a rail I H in hooked engagement with which is an L-shaped arm I42, one end of the arm I42 having a hook-shaped end portion I43 which is hooked over and in engagement with the rail I H. The arm I42 forms a mechanical connection between the rail HI and the wire positioning unit I2I and serves to transmit movement of the armature I30 of the electromagnet I20 to a movable part of the wire positioning unit I2 I.

The electromagnet I20 may be energized from any suitable source of current supply, not shown. The operation of the electromagnet is controlled by means of a switch, not shown, but which is operated to closea circuit to the electromagnet I20 for a brief interval during the application of each turn of wire 69 to the card 29. The switch for controlling the electromagnet I20 may be controlled by means of the drive shaft 54 or some other cyclically rotating part of the winding machine, the only condition being that the switch will momentarily close to cause energization of the electromagnet I20 at the required time when each turn of the wire 69 is being applied to the card 29.

The wire positioning unit I2 I, as shown in Figs. 11 to 16 inclusive, comprises a body I44 having an arm I45 secured to the top by means of screws I46 and extending in parallel spaced relation with a base I41 which is slidably mounted on the the wheels I52 being located in recesses I53 the base I41 being constructed to slidably rest in a track I48 formed in the horizontal top portion I26 of the support '8, the track I48 being cooperatively formed by an undercut side I48 in the top portion I25 and an angle strip I58 secured by means of screws II to the top portion I25. Four wheels I52 are rotatably mountedon the base I41 to engage the side walls of the track I48, the wheels I52 being located in recesses I53 formed in the corner portions of the base I41 and being arranged so that the peripheral portions of the wheels I52 will engage the sides of the track I48. The under surface of the base I41 is recessed at I54 to reduce the friction of the base I41 on the track I48. A comparatively light stem I55 is provided to urge the body I44 in one direction along the track I48. The type and form or stem employed for the purpose is a matter of choice but may comprise as shown in the drawings a comparatively stiff wire pivotally mounted at its lower end and having its upper portion I56 extending longitudinally within the track I48 and so that the free end of the stem I55 thrusts against the back of the body I44. The lower end of the stem I55 extends angularly oi the main portion and through the support H8 and is journaled therein and provided with a spring 232 to urge the stem I55 against the body I44, the spring 232 having one end engaging a lever 233 mounted on the stem I55 and the other end of the spring 232 being in holding engagement with the support I I8.

A turn block I51 is disposed in the space between the arm I45 and the base I41 of the body I44, the turn block I51 having a relatively large upper portion I58 extending in parallel spaced relation with a smaller lower portion I 58. The turn block I51 is pivotally supported in the body I44 by means of a pin I68 and a screw I6I, the pin I68 extending from the lower portion I53 of the turn block I51 and into the base I41 of the body I44 and the screw I6I extending through the arm I45 and into the upper portion I58 of the turn block I51, the screw I6I having a cylindrical head member I62 which is journaled in an aperture formed in the arm I45. A tubular spacer I63 is supported on th screw I6I and located between the turn block I51 and the undersurface of the arm I45. The turn block I51 is pivotally turned in one direction under the action of the fail I when the electromagnet I28 is energized, the turn block I51 being mechanically connected to the rail I by means of the arm I42, one end I64 of which is extended into andanchored to the upper portion I58 of the turn block I51. When the electromagnet I28 is deenergized the turn block I51 is returned to normal position by means of a coil spring I65 supported on the tubular spacer I63, one end of the sprin I86 being in hooked engagement with the back of the turn block I51 and the other end of the spring I65 being extended through an aperture I86 formed in the arm I45 of the body I44 and bent over as shown at I61. The armature I38 and the yoke I3I are returned to normal position by means of a spring 2 which may be secured at one end to the su ort H8 and have engagement with t e yoke I3I. It will be seen as shown in Fig. 16 that when the turn block I 51 is rotated under the action of the rail I the spring I65 will be wound up and that when the pull on the rail I is discontinued the spring I will restore the turn block I51 to normal position. It will also be seen in Fig. 16 that since the only mechanical connection between the wire positioning unit I2I and the rail I is by virtue of the hook-shaped end I43 of the arm I42, the wire positioning unit I2I may b moved lengthwise along the track I48 and along the rail I under the thrusting action of the stem I55 which is urged against the bod I44 by means of the spring 232.

The wire positioning unit I2I is equipped with a finger I88, the function of which is to guide each turn of wire to its required place and briefly hold each turn of wire in its required place on the card 28 where the edge on the card 28 is of ascending form. The difl'erent' positions taken by the finger I68 while the wire is being wound on the card 29 are shown in Figs. 22A to 29A inclusive. The finger I68 as shown in Fig. 16 is mounted in a plate I68 which is supported on a bolt I18, the threaded shank portion I1I of which extends transversely through the upper portion I58 of the turn block I51 which is drilled to receive the shank portion IH 01 the bolt I18. A nut I12 is provided on the bolt I18 to prevent withdrawal of the bolt I18 from the turn block I 51 and to serve as an adjustable stop to limit the distance of separation of'the plate I88 from the turn block I51 and from the plate 12. A coil sprin I13 which is mounted on the bolt I18 and located between the turn block I51 and the inner face of the plate I68 serves as a compressible spacer between the turn block I51 and the plate I88. The bolt I18 is provided with a radially extending pin 234 which rides in a slot 235 formed in the upper portion I58 of th turn block I51 to prevent rotation of the bolt I18. The manner in which the wire positioning unit I2I operates will be subsequently explained.

A spring guide 236 is provided to resiliently and separately engage the turns of wire on the straight edge 01' the card 28. The spring guide 238 is mounted on an inverted T-shaped support 231 which is adjustably held in the track I48 by means of a screw 238. The spring guide 236 is L-shaped and one free leg portion extends in parallel spaced relation with the support 231 and in close spaced relation with and transversely across the straight edge of the card 28.

To maintain the wire under suitable tension while the wire is being wound onto the card 28, wire tensioning means and a brake system cooperating therewith are provided in the winding head 26 and the wire tensioning means and the brake system will now be described.

The wire tensioning means as shown in Figs. 2. 3, 4 and 8 comprise a ilyer arm I14 and a system oi pulleys I15 comprising the pulleys I16. I11, I18. I18 and I88 carried by the ring gear 38 and the pulleys I8I and I62 carried on the fiyer arm I14. The pulleys I16, I11, I18, I18 and I88 are mounted in spaced relation and are located in advanced positions relative to the pulleys I8I and I82 and all pulleys are provided with low friction type bearings so that the pulleys are freely rotatable. The wire 68, as shown in Fig. 2. is led from the spool 68 and is trained through the system 01' pulleys I15 in a system of loops two of which are changeable in length under the action of the fiyer arm I14, the wire 68 after its passage through the system of pulleys I15 being finally guided by means of the plates II, 12. the bar II2, finger I68 and the spring guide 236 to the required points on the card 28 during the winding operation. The course of the wire 89 from the spool 80 to the card 29 is optional in some respects but should be such that the wire will be fed to the required point on the card 29 and will be maintained taut in its passage from the spool 80 to the card 29. One of several possible courses for the wire 89 is shown in Fig. 2, the direction in which the wire 69 runs through the pulley system I being indicated by arrow-points drawn on the line indicating the wire 89. In this case the wire 89 coming from the spool 80 passes over and in engagement with the pulley I 11 and after passin part way around the pulley I11 proceeds through the peripheral grooves in the other pulleys in the system of pulleys I15 in the following manner, from pulley I11 to pulley I18, to pulley I18 which is mounted in parallel spaced relation with the pulley I11, from pulley I18 to pulley I8I, supported on the flyer arm I14, thence to pulley I80 which is in an advanced position relative to pulleys I11 and I18, from pulley I80 to pulley i82 on the fiyer arm I14 and in parallel spaced relation with pulley I8I, from pulley I82 to pulley I19 and thence downward to the card 29. It will be seen that there are two loops in the wire pattern which are under control of the fiyer arm I14, one loop being identified as I83 and the other being identified as I84, the loop I83 bein where the wire 89 passes from the pulley I18 to the pulley I8I and from thence to the pulley I80 and the loop I 84 being where the wire 89 passes from the pulley I80 to the pulley I82 and from thence to the pulley I19. The loops I83 and I84 shorten during certain times and lengthen during certain other times in the operation of winding the wire 89 on the card 29 and one function of the fiyer arm I14 is to cooperate with certain other parts in the winding head 28 to maintain the wire 89 taut during its passage from the spool 80 to the card 29.

The fiyer arm I14 is pivotally supported at one of its end portions and so that the end portion on which the pulleys I8I and I82 are carried may move towards and away from the pulleys I11, I18, I19 and I80 and in a plane parallel with the plane of the ring gear 30. The fiyer arm I14 at its pivotally supported end portion I85 is supported, as shown in Fig. 8, on a flanged rotatable bushing 239 supported in a sleeve bearmg 240 which extends through an apertured plate I81 supported on a block I88 mounted on the front face of the ring gear 30. A shaft I88 extends through the parts 239 and 240 and supports a cam i89 having an apertured boss I90 which is secured to one end of the shaft I88 by means of a tapered pin I9I, the cam I89 being rotatable when the shaft I85 is rotated. The outer end of the shaft I88 as shown in Figs. 2, 3 and 8 is staked or otherwise secured as shown at 194 to a pointed lever I95, the pointed end of which is engageable in the teeth I98 of a toothed plate I91 which is secured by means of rivets I98, I98 or other suitable fastening means to the flyer arm I 14. The toothed plate I91 and the pointed lever I95 form a mechanical connection between the fiyer arm I14 and the shaft i38. When the flyer arm I14 is pivotally moved the shaft I88 is rotated to cause rotation of the cam I89 to control the operation of a brake device I99 which is operable to reduce the speed of or stop rotation of the spool holder 59 and the spool 80 and thus change the speed of rotation of the spool 60 relative to that of the ring gear 30.

The brake device I99 as shown in Figs, 7 and screw 202 mounted on the ring gear 30.

8 comprises a lever type brake shoe 200 and a lever 20I pivotally supported on the shank of a The brake shoe 200 is spaced from the ring gear 30 by means of an annular spacer 203 and is mechanically connected at its pivotally supported end to the pivotally supported end of the lever 20I by means of a boss 204. Supported on the free end of the lever 20I is a pin 205, secured in place by means of the nuts 208 and 201. The pin 205 supports a roller 208 which is engageable with the periphery of the cam I89 which, as shown in Fig. '7, has a high portion 209 abruptly terminating at one end in a low portion 2I0. When the roller 208 is on the high portion 209 of the cam I89 the free end of the brake shoe 200 is pressed against the brake drum against the action of a restoring spring 2I I, one end of which is secured at 2I2 to the brake shoe 200. the free end portion of the sprin 2 having bearing engagement with a post 2l3 mounted on and extending normal from the face of the ring gear 30. It will be seen as shown in Fig. 7 that when the high portion 209 of the cam I89 is in engagement with the roller 208 the brake shoe 200 bears against the brake drum 85 to retard rotation of the spool holder 59 and that the spring 2 Ls flexed so that spring pressure is developed therein. It will also be seen that when the cam I89 is rotated counter-clockwise to bring the low portion 2I0 of the cam I89 adjacent the roller 208 the restoring spring 2 will cause movement of the brake shoe 200 away from the brake drum 85. Initial setting of the cam I89 may be such that the low portion 2I0 of the cam I89 is adjacent the roller 208 when the fiyer arm I 14 is in the position shown in Fig. 2 and so that a slight rotation of the cam I89 in a clockwise direction will bring the high portion 209 of the cam against the roller 208. The high portion 209 of the cam I89 extends a considerable distance at a constant radius from the pivot in a counterclockwise direction from its point of termination in the low portion 2 I0 and then gradually merges with the low portion 2I0.- In Fig. 7 the brake shoe 200 is in maximum braking position and will be in maximum braking condition for any position of the flyer arm I 14 clockwise from a position somewhere near that shown in Fig. 2. The initial setting of the cam I89 may be changed, however, by grasping the handle I 93 and moving the pointed lever I 95 shown in Fig. 3 so that the pointed end of the lever I95 engages one of the other teeth in the toothed plate I91. This adjustment changes the angle of the fiyer arm I 14 at which the cam I89 outwardly moves the brake roller 208.

Since the shaft I88 on which the cam I89 is supported is mechanically connected to the fiyer arm I14 by means of the pointed lever I 95 and the toothed plate I91, the cam I89 is rotated when the flyer arm I14 i pivotally moved. The cam I89 is formed and arranged so that when the free outer end of the flyer arm I14 is moved from the transition or equilibrium position shown in Fig. 2 towards the center of the ring gear 30 the cam I89 is rotated in a counter-clockwise direction so that the high portion 209 is moved beyond the roller 208; the brake shoe 200 and the lever 20I are pivotally moved in a clockwise direction under the action of the spring 2 to release the brake shoe 200 from engagement with the brake drum 85. When the flyer arm I 14 and in consequence the cam I89 are rotated in a clockwise direction to bring the high portion 209 of the cam I99 in engagement with the roller 298 the lever MI and the brake shoe 299 are operated so that the brake shoe 299 engages the brake drum 55 to stop the rotation of the spool holder 59 and the spool 59.

The brake device I99 is operated by means of the fiyer arm I14 which swings towards or away from the position of the pulleys I19 and I99 during the operation of winding the wire 59 on the card 29. The fiyer arm I14 is equipp d with a counterweight 2I4 and a return spring 2I5. The counterweight H4 is secured by means of screws 2I5, H5. or other suitable fastening means to the pivotally supported end portion of the fiyer spring 2 I5 is attached at one end to the counterweight H4 and the other end of the return spring 2I5 is secured to a pin .2I1 mounted on the ring gear 39, the arrangement being such that the return spring 2I5 will constantly urge the long free end portion of the fiyer arm I14 away from the position of the card 29 to hold the wire 59 under required tension in the passage of the wire 99 from the spool 59 to the card 29. Undue outward or inward movement of the fiyer arm I14 is prevented by means of a stop device 2I9 comprising an apertured plate 2I9 and a pin 229, the pin 229 being mounted on the fiyer arm I14 and the plate 2I9 being mounted on the posts 2I3 and HI supported on the ring gear 39. The angle formed by the central axis of the spring 2I5 and a line connecting the arm pivot of the spring with the pivot of the arm I14 is normally slightly less than 90 degrees as shown in Fig. 2. This causes the moment of the spring todecrease as the arm is moved inward due to the decrease of the above-mentioned angle and consequent decrease of the perpendicular distance between the line of pull of the spring and the arm pivot. This decrease in moment compensates for increase of spring tension as the spring 2I5 is stretched and the effective tension remains constant throughout the travel of the arm I14.

The plates 1| and 12 as shown in Fig.2 are provided with embossings 222 and 229 respectively, extending outwardly of the front faces of the plates 1| and 12 and located along the relatively wide edge portions of the plates H and 12. The embossing 222 on the plate H is continued at one end into a tab 224 and the embossing 223 on the plate 12 is continued at one end into a tab 225, tab 224 being extended up wardly beyond the embossing 223 on the :plate 12 and tab 225 being extended downwardly beyond the embossing 222 on the plate H. The plate 1| is notched out at 225 to accommodate the tab 225 and a corresponding notch is provided at 221 in the plate 12 to accommodate the tab 224.

In order to wind the wire 59 on the card 29. the card 29 is mounted in the machine as shown in Fig. 1, the card 29 being clamped in place at its ends by means of the clamps 21 and 29 and so that the card 29 extends through the winding head 25 in such position that the ring gear 39 encircles the axisof the card 29. The wire 59 is led from the spool 59 through the system of pulleys I15 and to the card 29 in the directions indicated by the arrow points shown in Fig. 2. One end of the wire 59 may be manually held on a required point for starting the winding of the wire on the card 29 or may be secured at the required starting point by fastening the end of the wire in place by means of adhesive tape or other suitable holding means, the winding head 25 having been manually moved by means of the wheel along the bed 23 of the machine to the required position for starting the winding operation. The handle 49 is then operated to drive connect the apron 35 to the lead screw 39 and the machine is started so that the ring gear 39 turns about the position of the card 29 and the windin head 26 is moved lengthwise of the bed 23 under the action of the lead screw 39.

The direction of rotation of the ring gear 39 is indicated in Fig. 2 by an arrow shown on the ring gear 39 and it will be seen in this figure that that the wire 59 passes across edge portions of the card 29 and across relatively wide fiat surfaces of the card 29 during the winding operation. It will also be seen that the distance between the pulley I19 and the instant point of application of the wire 59 to the card 29 changes during the winding operation. For example, the distance between the pulley I19 and the instant point of application of the wire 59 to the card 29 indicated at 229 in Fig. 2 is greater than when upon further rotation of the ring gear 39 the wire 59 is passing across the opposite edge of the card 29 at the point indicated at 239. The change in distance between the pulley I19 and the instant point of application of the wire 59 to the card 29 Is due in most part to the transferring of the instant point of application of the winding from one edge of the card 29 to the opposite edge of the card 29. It is also due in some cases to the difference in width of the card 29 at points along the length of the card 29. When changes occur in the distance between the pulley I 19 and the instant point of application otthe wire 59 to the card 29 the rate of feeding of the wire 59 from the pulley I19 to the card 29 must increase or decrease to insure against over tensioning or under tensioning of the wire. The wire 59 is led from the spool 59 to the card 29 by a take-off mechanism involving the system of pulleys I15 and the fiyer arm I14. The wire 69 is led from the spool 59 in a clockwise direction to the pulley I11.

The take-0iT mechanism as bounded by pulleys I11 and I19 may take up or give out wire from either end, each end being somewhat independent of the other. The spool 59 and the spool holder 59 may be rotated in the same direction as and at the same speed as, or faster or slower than the ring gear 39, the fiyer arm I14 may be moved relative to the axis of the ring gear 39 and the brake device I99 may be operated to cooperate in maintaining the tension of the wire 59 practically constant during the passage of the wire from the winding head 25 to the card 29. The actions of the flyer arm I14 and consequently of the brake device I99, the spool holder- 59 and the spool 59 are governed by the algebraic sum of the input to or output of the take-oil. It will be seen by looking at Fig. 2 that the arm I14 is pulled by means of the wire 59 towards the axis of the ring gear 39. If the brake is marginally engaged, as shown in Fig. 7, when the arm I14 is pulled inward the brake device I99 will not apply a braking action to the spool holder 59, there is no direct driving connection between the ring gear 39 and the spool holder 59 and the only means of transmitting rotation of the ring gear 39 to the spool holder 59 and the spool 59 are through the wheels carried around by the ring gear 39 and operable within the spool holder 59 and the wire system leading from the spool 59 end of the arm I19 at this time.

to the card 29 by way of the system of pulleys I15. As the ring gear 99 begins to rotate there is a slight lag between the rotation of the ring ear 99 and the spool holder 59 and spool 99. There is also a slight inward movement of the outer The arm I19 begins to hunt for a condition of equilibrium, wire is withdrawn from spool 99, the spool holder 59 begins to rotate in the same direction as the ring gear 30 and gradually increases in speed until the take-oil mechanism is in equilibrium and the wire 69 is running from the spool 99 to the card 29 at the required rate.

As the ring gear 30 rotates and the winding head 29 is moved along the bed of the machine, the wire 59 is wound on the card 29. When the arm I19 moves outwardly to a predetermined point the cam I99 is rotated to operate the lever 29I to cause the brake shoe 209 to bear against the brake drum B to slow down the rotation of the spool holder 59 and hence the spool 69 relative to the ring gear 99.

During the instants when the lead-of! edge of the pulley I19 is passing in level with the plane of the card 29 and is proceeding past an edge of the card as shown in Fig. 18 and during parts of the cycle when the pulley I19 is in effect rounding an edge of the card 29, the take-of! is not appreciably giving or receiving wire. At other times the take-off is appreciably giving out or receiving wire at the pulley I19. At the pulley I'll the take-off will receive wire whenever the brake is released and the tension of the wire 99 overcomes the friction of the spool holder 59 on its wheels 55, or whenever the brake I99 is operating and has not stopped the relative rotation between the ring gear 30 and spool holder 59. The take-off will release wire to the pulley I19 when the brake is released and there is deceleration of the rin gear 30 which creates a torque in the spool greater than that caused by the tension. With the wire 69 coming off the spool 99 in a clockwise direction to the pulley I11 as shown in Fig. 2, so that pulling wire from the spool 99 requires, in effect, clockwise relative relation between the spool 90 and the ring gear 90 wire will be released from the take-off to the spool 60 during rapid deceleration of the speed of the ring gear 99. Rapid deceleration during the winding operation is less likely to occur than rapid acceleration. With the take-off arranged as in Fig. 2 the wire 59 may feed out from the spool 99 quite rapidly during the initial turning of the ring gear 90 in a counter-clockwise direction when the winding machine is started and will therefore not impair rapid acceleration of the machine to normal speed.

When the sum of the take-ofis intake is positive, the arm I14 moves outwardly and when the sum of the intake is negative, the arm I19 moves inwardly. When the arm I19 moves outwardly or inwardly beyond the transition point between zero and 100 per cent braking at the step on the cam I89, the brake I99 is automatically operated to restore the system to equilibrium at the transition point. By adjusting the pointed lever I95 to required positions on the toothed plate I91 the equilibrium of the system may be set as required. So long as the arm I19 does not hit its stops, the tension on the wire 69 is maintained at the desired value, except as afiected in a very minor way by pivot friction and force required to operate the brake I99. One end of the wire I59 is fastened to the card 29 and presents no problem in maintaining this tension unless it breaks. The tension assesses at the other end which is fastened to the sometimes freely rotating spool 99 must be the same. The torque caused by the tension is, therefore, always equal to the sum of the torque caused by the brake I99, spool holder wheel friction which is constant, and the torque due to acceleration or deceleration of the spool holder 59.

During the winding of each turn of the wire 99 on the card 29 the plates H and 12 serve to steady the card 29 at the instant point of winding and also aid somewhat in guiding the turn of wire to its required place on the card 29. The plate II is maintained in constant spaced relation with the frame ll and move at constant speed along the under surface of the card 29 while the machine is in operation. The wire 99 is guided against the embossed edges of the plates H and 12 by the finger I59 as shown in Figs. 23A and 29A and to the required position on the front edge 229 of the card 29 by the finger I99 and the bar I I2. 0n the rear edge 299 of the card 29 (the straight edge) the wire 99 is guided in place by means of the resilient finger 299. The plate 12 is thrust away from the frame 9| and out of the plane of the plate 1| once for every cyclic movement of the ring gear 99. The plate 12 is operated by means of the plunger 9|, the cam surface of which bears against the wheel Ill. The plunger II is operated by means of the cam ring 91 bearing on the wheel 99, the plunger 9I being depressed when the high spot 91 on the cam ring 91 comes into engagement with the wheel 99. The plunger 9| gradually moves downward under the action of the cam ring 91 and against the thrust of the restoring spring 92 starting at the position shown in Fig. 19 when the wire 99 is passing over the forward edge 229 of the card 29 and continuing until the position shown in Figs. 17 and 21. Under this condition the plate 12 is thrust further away from the frame 9| and beyond the plane of the plate 1|. The movement of the plate 12 is against the action of the springs 95 which restore the plate 12 to the same plane as the plate 1| when the high spot 91 on the cam ring 91 passes beyond the wheel 99. The cam ring 91 is formed and positioned so that the low spot 99 engages the wheel 99 just before the wire 99 is laid across the lower side of the contoured edge of the card 29. From then, for 350 degrees of counter-clockwise rotation of the ring gear 99, the plate 12 is gradually thrust beyond the plane of the plate H to guide and support the turn of wire being laid on the card 29. The plate 12 carries the bar Il2 into position to guide and support the turn of wire 69 during the critical period of winding the turn of wire across the contoured forward edge 229 of the card 29. The cam ring 91 is shaped so that it operates to cause the plate 12 to be moved out of the plane of the plate H at the same rate as the platform 92 is normally moved along the bed 29 of the machine. Since the winding head 29 is being moved in one direction along the bed 29 of the machine and along the card 29 and during part of this time the plate 12 is being thrust in the opposite direction and at the same rate as the platform 92, the effect is that for 350 degrees of rotation of the ring gear 39 the plate 12 and bar I I2 do not move relative to the card 29 and the wire 99 which has been laid on the card, while the plate H is moving relative to the card 29.

The bar II2 extends transversely of the embossing 229 and to the outer face thereof and operates in the space III between the plates 1| and 12 and rides along the forward edge 229 of the card 29 when the plate 12 returns to the plane of the plate 1|. If the card width is increasing, the bar I|2 will be moved to accommodate the increasing width of the card 29 since the bar H2 is mounted on the carriage IIII operating in the track I05 against the action of the spring motor I and the tow line II5. If the card width is decreasing, the bar H2 is held against the forward edge of the card 29 by the action of the spring motor H4. The bar II2 as shown in Fig. 9 engages and helps support each turn of wire 69 as the wire 69 comes across the front edge 229 of the card 29. In Fig. 9 the bar H2 is in engagement with the last turn of the wire 69 being wound on the card 29 and it will be seen, therefore, that the last turn of the wire 69 cannot slip along the narrowing portion of the card 29, also. that the embossing 223 on the plate 12 is in required position for guiding the wire 69 to its required place on the card 29 when the wire 69 is being laid across the upper surface of the card 29. After the turn of wire 69 is laid across the upper face of the card 29 and partially across the lower face, the high spot 91 on the cam ring 81 passes beyond the wheel 93, the plunger 9| is then thrust upwardly by means of the return spring 92 and the plate 12 is moved into the same plane as the plate 1| by means of the springs 85 and so that the plate 12 and the bar H2 are in required position to permit another turn of the wire 69 to be wound on the card 29. It will be seen, therefore, that the plate 12 and the bar I|2 cooperate to guide each turn of wire to its required place on the card 29 and the plate 12 and bar I I2 briefly hold the turn of wire in place against slipping along the card 29 when the edge of the card is of descending form.

In Figs. 1'1 through 21A the relative positions of the critically operating parts provided in the Winding head 26 for insuring that each turn of wire will be guided to its required place and supported in its required place durin the critical period of winding each turn are shown in steps occurring in a winding cycle. In Figs. 17, 17A and 17B it will be seen that when the pulley I19 has traveled about 260 degrees in a counterclockwise direction from a point perpendicular to the upper surface of the card 29 which on a clockface would be the 12 oclock position, one turn of the wire 69 is coming from the pulley I19 and is about to be laid across the lower surface of the card 29. The plate 12 at this time as shown in Fig. 17A is out of the plane of the plate 1| and in cooperation with the bar H2 is holding the last completed turn of wire on the card 29 in place. The finger I68 at this time, as shown in Fig. 17B, is in position to allow the next turn of wire to be laid acros the forward edge 229 of the card 29. When the pulley I19 reaches the 3 o'clock position as shown in Fig. 18, the oncoming turn of wire 69 is laid completely across the lower surface of the card 29. At this time and as shown in Fig. 18A the plate 12 is in the same plane as the plate 1| and the bar H2 is in registry with the plates 1| and 12. The finger I68 as shown in Fig. 18B is still in the same position as in Fig. 17B. When the pulley I19, as shown in Fig. 19, is almost to the 12 oclock position and the wire comin from the pulley I19 is perpendicular relative to the card 29 and so that the turn of wire 69 extends across the forward edge 229 of the card 29, the bar 2 as shown in Fig. 19A is supporting the turn of wire on the forward edge of the card 29 and so that the wire 69 will not slip along the contoured forward edge of the card 29. The plate 12 has started to move out of the plane of the plate .iI to guide and hold the wire 69 against slip ing along the card 29 while the wire is being laid across the upper surface of the card 29. In Fig. 20 the pulley I19 has traveled counter-clockwise and reached about the 4 oclock position and the last full turn of wire is still being supported in place by the plate 12 and the bar 2. By this time the tension on the wire 69 has caused the last completed turn to slightly sink into the sharp edges of the card 29 and so that the wire will not slip along the card 29 when the plate 12 and bar |I2 are moved away from the turn of wire. In Figs. 21 and 21A the cycle has been completed and the parts are in the same positions as in Figs. 17 and 17A but one more turn of wire has been made on the card 29,

The wire positioning device 8 operates to guide each turn of wire 69 to the forward edge 229 Of the card 29 and will hold each turn of wire in required position on the forward edge of the card when the edge line on the forward edge 229 of the card is of ascending character during the critical period of winding the turn of wire 69 across the forward edge 229 of the card 29 and until the turn of wire is somewhat impressed in the edge of the card 29. The electromagnet I20 is employed to cause the finger I68 to be withdrawn from its normal position relative to the card 29 once for each turn of wire. The electromagnet I29 may be energized from any suitable source of current supply under control of a switch, not shown, but which may be located, for instance, in the head stock 24 and controlled by operation of the lead screw 39 or shaft 54 so that the electromagnet will be energized at the required time.

In Figs. 22 through -29A the relative critical positions of the parts employed in the wire positioning unit I2I to insure guiding and supporting each turn of wire during the critical period of winding the turn of wire across the forward edge 229 of the card 29 for up slope winding are shown in steps. When the pulley I19 is nearing the 3 oclock position, as shown in Fig. 22, the finger I68 is in the position shown in Fig. 22A and ready to guide a new turn of wire to its required place. In Fig. 23 the pulley I19 has passed slightly beyond the 3 oclock position and the new turn of wire is starting to be laid across the forward edge 229 of the card 29. It will be seen, as shown in Fig. 23A that as the new turn of wire is passing across the forward edge 229 of the card 29 the finger I68 and plate 12 are cooperating to guide the turn of wire to its required place. In Fig. 24 the pulley I19 has been carried counter-clockwise to about the 10 oclock position and the turn of wire has been laid across the forward edge of the card 29. The finger I68 as shown in Fig. 24A is still holding the turn of wire just made from slipping back along the downward slope on the forward edge of the card 29 and the plate 12 has been moved out of the plane of the plate 1| and so that as the wire passes across the upper surface of the card 29 the wire will be guided to its required place on the upper surface of the card 29. In Fig. 25 the pulley I19 has reached about the 7 oclock position and the turn of wire has been laid across the upper surface of the card 29 under guidance of the plate 12 and the spring guide 236. At this time the finger I68 as shown in Fig. 25A is still holding the last turn made across the forward edge of the card and the plate 12 is in such position that it is still resting against the wire on the upper surface of the card 29. The plate 1I however has been carried along to such position that it will not interfere with laying the wire across the lower surface of the card 29, In Fig. 26 the pulley I19 is in the 6 oclock position and ready to lay the wire across the lower surface of the card 29. At this time, as shown in Fig. 26A, the finger I68 has been withdrawn from engagement with the wire 69, the electromagnet I20 having been energized to cause withdrawal of the finger I68 to the position shown. The finger I68 has been moved to the right of the last turn of wire by the thrust of the spring I13 in which pressure has been built up while the finger I68 was in 'the position shown in Fig. 25A and the winding head 26 and the wire positioning device II8 were being moved along the bed of the machine and relative to the card. In Fig. 27 the pulley I19 has passed counter-clockwise beyond the 6 o'clock position, the electromagnet I20 has been deenergized and the finger I68 as shown in Fig. 27A is coming back to normal position but and as shown in Fig. 28A the finger I68 is in normal position and where it will bear against the embossing 223 on the plate 12 until the plate 12 is withdrawn a very short distance later, At this point the cycle of laying one turn of wire 69 has been completed and another turn is about to be started across the forward edge of the card 29. In Fig. 29 the pulley I19 has passed counterclockwise beyond the 3 oclock position and proceeding to lay the wire across the forward edge of the card 29. At this time the finger I68 is in position for guiding and holding the new turn of wire in place and the plates H and 12 are in the same plane.

When the electromagnet I20 of the wire positioning device H8 is energized the yoke I3I is rocked downwardly from the position shown in Fig. 11 and so that the rail I4I pulls the arm I42 to rotate the turn block I51 against the action of the return spring I65. It will be seen, as shown in Fig. 16, that when the rail MI is operated to pull the arm I42, the turn block I51 is rotated in a right-hand direction, In thi movement the finger I68 is moved from the position shown in Fig. A to the position shown in Fig. 26A. In Fig. 25A the sharp end 23I of the finger I68 projects between two turns of the wire 69 wound on the card 29 and this is the position of the finger I68 when the electromagnet I20 is deenergized and a turn of the wire 69 is taking its required position on the forward edge 229 of the card 29. In this case the finger I68 is holding the last turn of wire from slipping towards the left on the card 29. The wire positioning device I I8 will operate as required if the switch momentarily closes the circuit to the electromagnet I20 when the lead-oil pulley I19 is at approximately 270 degrees counter-clockwise from the point at which the wire first touches the curved edge 229 of the card 29, or in other words, when the leadoff pulley I19 is in the 6 oclock position, The switch must open immediately after closing so that the electromagnet I20 has time to be fully released and the parts of the wire positioning unit I2I have time to return to equilibrium and in place to support and guide the next turn of wire while it is being laid across the sloped edge 229 of the card 29.

When the width of the card 29 is increasing,

the wire positioning unit I2I is in effect cammed by means of the card and wire along the track I48 against the action of the stem I55, the pressure of which is barely sufllcient to thrust the wire positioning unit I2I along the track I48 when there is no resistance to such motion. when the electromagnet I20 is energized to cause the finger I68 to be withdrawn from the turn of wire on the card 29 the wire positioning unit does not move towards the card 29 since the side thrust of the body I44 on the track I46 is suificient to stay the body I44 in its place even against the thrust of the stem I55. While the finger I88 is in engagement with the last turn of wire 69 and the winding head 26 is moving along the bed of the machine the plate I69 is pressed towards the turn block I51 against the action of the spring I13. When the finger I68 is disengaged from the last turn of wire 69 the plate I69 is moved away from the turn block I51 until the nut I12 engages the turn block I51. When the electromagnet I20 releases, the stem I55 and the spring I65 will return to equilibrium but the spring I65 having had developed therein a greater force than the stem will turn the turn block I51 until the arm I42 strikes the body I44. During the latter part of this movement the finger I68 is pushing against the last turn of wire 69 and this thrust is strong enough to push the body I44 back along the track I48 against the pressure of the stem I55. The finger I88 is now in position to guide and support the next turn of wire 69 as the wire 69 comes over the forward edge 229 of the card 29.

What is claimed is:

1. A machine for winding strand material on. a. support comprising means for maintaining said support in required position for winding the strand material thereon, a winding head operable to wind the strand material onto said support and means carried within said winding head and extending relatively close to a predetermined portion of said support and operating to guide the strand material to required positions on the predetermined portion of said support and operable to also briefly hold each turn of wire against slipping from its required position on said support during the critical period of applying the wire to the predetermined portion of said support.

2. A machine for winding strand material on a support comprising means for maintaining said support in required position for winding the strand material thereon, a winding head operable to wind the strand material onto said support, a bar slidably supported in said winding head and operable to guide the strand material to a required position on said support and means in said winding head to slidably support said bar.

3. A machine for winding wire in a plurality of spaced turns on a card, comprising a support, means on said support for maintaining said card in position for the wire to be wound thereon, a winding head supported on said support, means to cause relative movement of said winding head and said card, a rotatable member in said winding head encircling the position of said card and operable to turn about said card to wind the wire onto said card, means to operate said rotatable member and wire positioning means carried in said winding head and extending adjacent an edge of said card and operable to hold each turn of wire against slipping along said card during the critical period of winding the turns of wire across the edge of said card.

4. A machine for winding wire in a plurality of spaced turns on a card. comprising a support,

means on said support for maintaining said card in position for the wire to be wound thereon, a

winding head supported on said support, means to cause relative movement of said winding head and said card, a rotatable member in said winding head encircling the position of said card and operable to turn about said card to wind the wire onto said card, means to rotate said rotatable member, and a plurality of wire positioning means carried in said winding head and extending adjacent edge portions of said card and operable.;;t o hold each turn of wire against slipping along said card during the critical period of winding th turns of wire onto said card.

5. A machine for winding strand material on a flat support comprising means for maintaining said support in required position for the strand material to be wound thereon, a winding head operable to wind the strand material onto said support, plate means supported in said winding head and cooperatively forming an opening extening diametrically of said winding head, track means carried by said plate means, a bar movably supported in said track means and operable to guide the strand material to a required position on an edge of said support and means to move said bar relative to an edge of said support.

6. A machine for winding strand material on a fiat support comprising means for maintaining said support in required position for winding the strand material thereon, a winding head, an apertured rotatable member in said winding head arranged around said support and operable to rotate around said support, means to rotate said member, means to cause relative movement of said winding head and said support, a supply of strand material operable to be wound on said support and carried by said winding head, strand guiding means movably supported in said winding head and located in the aperture in said member and operable to guide said strand material across an edge of said support during the winding operation and means to move said strand guiding means into positions to guide said strand material across an edge of said support.

'7. A machine for winding strand material on a flat support comprising means for supporting said support in required position for winding the strand material thereon, a winding head operable to wind the strand material onto said support, a movably supported guiding member carried by said winding head and movable toward an edge of said support, said guiding member being operable to guide the strand material to a required position on an edge of said support and means to operate said guiding member to the required guiding position.

8. A machine for winding strand material on a fiat support comprising means for supporting said support in required position for winding the strand material thereon, a'winding head operable to wind the strand material onto said support, a pivotally supported finger carried by said winding head and movable relatively to an edge of said support, said finger being operable to guide the strand material to a required point on an edge of said support, means to urge said finger toward the edge of said support, an electromagnet to control the operation of said finger and means to control the operation of said electromagnet.

9. A machine for winding strand material on a fiat support comprising means fOr supporting said support in required position for winding the strand material thereon, a windin head operable to wind the strand material onto said support, a pivotally supported finger carried by said winding head and movable toward an edge of said support, said finger being operable to guide the strand material to a required point on an edge of said support, mean to ur e said finger toward the edge of said support, an electromagnet to control the operation of said finger and means to control the operation of said electromagnet.

10. A machine for winding strand material on a flat support comprising meansfor supporting said support in required position for the strand material to be wound thereon, a winding head operable to wind the strand material onto said support, a pivotally supported turn block carried by said winding head, a body supporting said turn block, a track for said body, means to urge said body along said track, a finger supported on said turn block and extending toward an edge of said support, said finger being operable to guide the strand material to a required position on said sup- Dori; when said turn block is turned in one direcof spaced turns on 'a card having a front edge not in parallel with the rear edge, comprising a support, means on said support for maintaining said card in position for the wire to be wound thereon, a winding head supported on said support, means to cause relative movement of said winding head and said card, rotatable means in said winding head encircling the position of said card and operable to turn about said card to wind the wire onto said card, mean to operate said winding head, a bar carried in said winding head and extending adjacent the front edge of said card, a finger device carried in said winding head and extending adjacent the front edge of said card a and in spaced relation with said bar, said finger device and said bar being operable to hold each turn of wire against slipping along the front edge of said card during the critical period of winding. the turn of wire across the front edge of said card and a resilient guide carried in said winding head and extending toward the rear edge of said card and operable to guide each turn of wire to a required position on the rear edge of said card during the critical period of winding the turn of wire across the rear edge of said card.

12. A machine for Winding strand material on a flat support, coi iprising means for supporting said support in required position for windin the strand material thereon, a winding head operable along the position of said support, an apertured rotatable member in said winding head disposed around said support and operable to turn about the axis of said support to carry said strand material around said support, means to turn said member, means to cause relative movement of said winding head and said support, a pair of plates supported in the space defined by said member, said plates being slightly spaced from each other to cooperatively form an opening to accommodate said support, a bar movably supportedon one of said plates and extending into the space between said plates, means to move said bar in one direction in the space between said plates and toward an edge of said support, a turn 

